Continuity mistake: After the golden army bots awaken, it zooms out to show how big the army is, when they do the prince and princess disappear in the background, then reappear.
Suggested correction: There are two black silhouettes on the background, they should not be black, but still.
Continuity mistake: When Prince Nuada holds up the golden egg-shaped "Forest God" pod, it's in his right hand. After it opens and he goes to take out the green object, he's holding it in his left hand and takes it out with his right hand.
Suggested correction: Between frames, where the Prince holds the egg with two different hands, there is a shot with Hellboy, long enough for the Prince to switch hands.
He was off camera for 1 second. His left arm was down by his side and his right arm stretched out. Really not enough time to switch hands when he showed no intention of bringing his left arm up and given how slow and deliberate he was moving.
Revealing mistake: The sealing caps of the map container have a slightly larger diameter than the container itself. When placed horizontally on a flat surface, the middle should not touch the surface. When the Prince rolls it on the table to reveal the map, the map is CGI.
Suggested correction: The fact the end caps being larger than the middle is correct, however, the middle section's reduced diameter is not the portion that touches when rolled. The middle portion has elevated sections that are what touch the table to reveal the map. When the Prince holds it up before rolling, the elevated portions on the middle are evident. Also, the end caps were not heated like the middle when rolled so no marks are left.
Continuity mistake: When Abe and Hellboy get drunk together, they move into the bedroom where Liz is sleeping. To start off with Hellboy is to the right of Abe and Abe is to the left of Hellboy, but suddenly we get a different view and this time it's a mirror image - Hellboy is to the left of Abe and Abe is to the right of Hellboy.
Suggested correction: The scene starts with Hellboy on the right and Abe on the left as they face Liz. Hellboy and Abe then turn around with their backs turned to Liz. The so called "mirror swap", last glimpse of the two is a now front shot of Hellboy and Abe with each being on the correct side of one another.
